Hi Ishan

Computer science is a very broad field . In this field you'll go through programming languages, coding, database management system, computer graphics/network, Artificial intelligence etc. 

- field of specialization in computer science are:

. Computer Architecture and organization

. E-commerce & ERP and multimedia Applications

. Foundations of computer systems

. Electronics

. Database systems

. Networking

. Operating systems

Choosing a field for specialization is a difficult task. 

Explore all the possible fields and try some courses. 

Choose your specialization based on your interests and skills. 

- if you have interest in testing , building and deploying mobile applications  then you can go for MOBILE APP DEVELOPMENT

- Artificial intelligence: includes robotics, natural language processing, machine learning etc 

- computer and Network Security: it focuses on advanced operating system, database management , cryptography etc

- software Engineering: this specialisation pla ces importance on learning programming languages.  Program includes software security courses on compilers, computer systems and database.

- human computer interaction: creates next generation of tech and computers. 

Do not choose your field of specialisation based on expected salary. Computer science is the most popular field and you can do best in field of specialisation you are interested in and passionate about and also in which you can invest significant amount of time and energy on.

All The Best!!